package com.yishan.config;

import com.yishan.domain.User;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.springframework.web.servlet.HandlerInterceptor;

/**
 * @Author yishan
 * @Date 2021/5/6 0006 18:12
 * @Version 1.0
 */
public class LoginInterceptor implements HandlerInterceptor {

	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

		//获取请求的RUi:去除http:localhost:8080这部分剩下的
		String uri = request.getRequestURI();

		//UTL:除了login.jsp是可以公开访问的，其他的URL都进行拦截控制
		if (uri.indexOf("/login") >= 0) {
			return true;
		}

		System.out.println("--");
		//获取session
		HttpSession session = request.getSession();
		User user = (User) session.getAttribute("loginUser");

		//判断session中是否有用户数据，如果有，则返回true，继续向下执行
		if (null != user) {
			return true;
		}

		//不符合条件的给出提示信息，并转发到登录页面
		request.setAttribute("msg", "您还没有登录，请先登录！");
		request.getRequestDispatcher("/login.jsp").forward(request, response);

		return false;

	}
}
